JPS58224059A - Die casting machine - Google Patents

Abstract

PURPOSE:To improve the quality of products and the efficiency of production, by forming the bottom surfaces of charging paths for molten metal wherein the molten metal supplied into cylinders for injection molding is forced up to biscuits by pistons for injection into the slopes ascending in the extrusion direction. CONSTITUTION:While both dies 45, 46 are clamped, molten metal 37 is supplied into cylinders 23 for injection. The bottom surface of the chamber in each cylinder 23 here is inclined so as to ascend successively upward toward the forward end. The molten metal 37 supplied into the charging path 44 in the cylinder 23 is extruded to a biscuit 49 side by the low speed driving of the piston 23a for injection and the air in the cylinder 23 is admitted into a cavity 50 in precedence to the molten metal 37 and is removed through an air vent. The piston 23a is then driven at a high speed to force and pack the metal 37 through the path 44, the biscuit 49 and gate 51 into the cavities 50, 50..., whereby the molten metal is cast. The entry of air in the molten metal is thus decreased, the quality of the product is improved, and the molten metal remaining in the biscuits, gates, etc. can be solidified earlier than the molten metal in the cavities; therefore, the amt. of the residual molten metal therein is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a die casting machine that can improve the quality of products.

In general, a die casting machine, as shown in FIG. 4. Arrange a movable mold 5 and a movable frame drive device 6 that move toward and away from the fixed mold 3 fixed to the movable frame 4, and after bringing both molds 3.5 into close contact, as shown in FIG. 2(a). As shown in FIG.
0, low speed drive of the piston 11 (see Fig. 2 (1)))
The hot water supply path 12, biscuit 13, runner 14 and gate 1 in the cylinder 7 are
5 into the molding cavity 16 of each mold (see FIG. 2(d)), and casting is performed.

By the way, in the casting machine described above, since the bottom surface 12a of the cylindrical hot water supply passage 12 in the cylinder 7 is formed horizontally, the molten metal 10 accumulates in the lower half of the hot water supply passage 12, while air remains in the upper half. By driving the piston 11, at low speed, the molten metal 1o begins to be press-fitted into the cavity 16 with air remaining in the cylinder 7, as shown in Figure 2 (+), and at high speed, as shown in Figure 2 (C). As shown, the molten metal 10 is mixed with the air in the cylinder 7 and then press-fitted into the cavity 16. Therefore, the product 1 as shown in Figures 3 and 4
7.18, there was a high possibility that shrinkage cavities, etc. would occur, and there was a problem that the quality would deteriorate.

Moreover, if the residual molten metal 1o in the biscuit 13, runner 14, and gate 15 is reduced, the molten metal 10 will solidify faster than the molten metal 1o in the cavity 16, and at the time of solidification, it will be mixed into the molten metal 10 in the biscuit 13. The air moves into the molten metal 10 in the cavity 16 and the product 17.
18, sink marks and shrinkage cavities are more likely to occur. For this reason, the amount of molten metal 1o remaining in the biscuits 13 etc. is increased to a certain extent,
The molten metal 1o in the cavity 16 had to solidify more quickly than the molten metal 10, which caused a screw problem.

Furthermore, in the above-mentioned casting machine, as mentioned above, the hot water supply path 1
Since the bottom surface 12a of 2 is horizontal, when the cavity 16 is provided below the biscuit 13 at the tip of the hot water supply path 12, the molten metal 10 is supplied from the hot water supply port 9 to the hot water supply path 12, and at the same time, the molten metal 10 is supplied from the biscuit 13 to the runner 14. and gate 15
Before the molten metal 10 is forced into the lower cavity through the piston 11, the molten metal 10 flows and begins to solidify, causing uneven solidification in the product. Therefore, as shown in FIGS. 3 and 4, the cavity can only be provided above the biscuit 13 at the tip of the hot water supply path. There was a problem that it was not possible to cast (see Figure 9).

The present invention has been made in order to solve the above problem, and the bottom surface of the molten metal supply path for extruding the molten metal supplied into the injection molding cylinder from the hot water supply port to the biscuit by the injection piston is fixed in the extrusion direction. The cavity is formed on an inclined surface that rises sequentially to allow air from the hot water supply path to flow into the cavity, and then molten metal is forced into the cavity to reduce sink marks and shrinkage cavities that occur on the product and improve the quality of the product. In addition, it is possible to increase the production efficiency by effectively utilizing the material by reducing residual molten metal in the biscuits and the gate.Furthermore, it is possible to provide a cavity under the biscuit through the gate. The purpose is to provide a die casting machine that can.

The die-casting machine according to the present invention passes the molten metal, which is extruded from the biscuit into the molding cavity formed by a pair of closed molding molds, into the injection molding cylinder by the injection piston. In a die casting machine that obtains a molded product by injecting the molten metal into the injection molding cylinder through the molten metal feed port, the bottom surface of the molten metal feed passage in which the molten metal supplied from the molten metal feed port into the injection molding cylinder is pushed out to the biscuit by the injection piston, is sequentially moved in the extrusion direction. It is characterized by being formed on an ascending slope.

The present invention will be specifically described below based on the embodiments shown in FIGS. h to 20.

In FIG. 5, 21 is a material supply device, 22 is a melting furnace,
32 is a water heater, 23 is an injection molding cylinder, 24 is a fixed frame, 25 is a movable frame, 26 is a movable frame drive device, 27 is a product holding device, 28 is a product finishing device, 29 is a packaging device, and 30 is a return device. , 31 is an operation panel.

As shown in FIGS. 6 and 7, the material supply device 21 spirally feeds the ball ingot 33 into a preheated case
The ball ingot 33 is guided into the melting bot 36 of the melting furnace 22 by the guide of the supply chute 35 which runs around the inner circumferential surface of the melting pot 36 and melted, and the exhaust heat of the molten metal 37 is guided into the preheating case 34, and the ball ingot 33 is Temperature sensor such as thermocouple +
A control damper 39 linked to the j3i controls the temperature and preheats the vehicle.

The molten metal 37 in the melting furnace 22 is transferred to the melting pot 3
When the cylinder 41 for opening and closing the lid 40 covering a part of the cylinder 6 is driven to open, the molten metal 37 is supplied into the cylinder 23 from the hot water supply 43 of the injection molding cylinder 23 by the hot water pump 42 constituting the hot water supply device 32. (Figure 11 (-
)reference).

Fixed frame 24 having the injection molding cylinder 23
A fixed mold 45 as a mold is mounted on the fixed roots, and a movable frame 25 that moves back and forth with respect to 2A is mounted with a movable mold 46 as a mold, respectively, on a mold clamping device 47. ..., 4
7, it is removably fixed. As shown in FIG. 8, the injection molding cylinder 23 is mounted on the fixed frame 24 of the machine base 52'' with a support frame that is tilted so that the bottom surface of the inner chamber of the cylinder gradually rises toward the tip. 48. At the tip of the cylinder 23, there is a hole 44 coaxially communicating with the cylinder inner chamber 44a.
1) is provided in the fixed mold 45, and the inner chamber 44a and hole 44b are
The hot water supply path consists of 4 tatami mats.

The movable mold 46 includes a movable mold 46 and a fixed mold 45.
When in close contact with each other, the tip of the hot water supply path 44 is closed (closed).
biscuit) 49, molding cavities 50°..., 50 disposed above, below, left and right of the biscuit 49, and a gate 51 that communicates each cavity 5o with the biscuit 49.
．． . ..., 50 are provided.

On the other hand, the molded product 53 (see FIG. 9) cast in the cavity 50 is discharged from the movable mold 46 by the extrusion device 54 when the mold is opened, and is discharged from the product holding position A (see FIG. 5). The product is held in a product holding device 27 located at a point (indicated by a dashed line in the middle).

The main product holding device 27 includes a trimming die 55 having a hole (not shown) into which the product 53 is fitted, and a trimming arm 56 that connects the die 55 to both molds 45 and 46.
A drive cylinder (not shown) that advances and retreats between the molds 45 and 46 from the horizontal direction when the two molds are separated from each other. The die 55 is shaped so that it can fit into the hole of the die 55.

On the end face of the product holding device 27, there is a release agent coating nozzle 57 serving as a coating device. . . , a plurality of 57 are provided A, and the product holding device 27 holding the product 53 is attached to both the molds 45 and 46.
When pulling out from the gap, the recesses 45a of each mold 45°46,
The mold release agent can be sufficiently applied to 46a by time control.

” The product 53 held by the die 55 is transferred to the mold 45.
Finishing is performed by the finishing device 28 at a finishing position B (shown by a solid line in FIG. 5) outside the 46th interval.

The finishing device 28 is approximately composed of a product extrusion punch 58 and a punch driving cylinder 59, and the punch 58 is driven by the punch driving cylinder 59 by △ to drive the trimming die 55 located at the finishing position B. Paris formed during extrusion and casting from the product 53, and scraps 60 formed on the biscuit 49 and gate 51
etc. are removed and finishing processing is performed.

The finished products 53 as described in item 2 are packed into boxes 63 which are temporarily stopped on a conveyor 62 via a product chute 61 in fixed numbers.

On the other hand, during the finishing of the product 53, the particles 60, etc. removed from the product 53 are returned to the melting furnace 22 by the return device 3o before they are completely cooled down, so that they can be reused. .

In the return device 3o, particles, waste 60, etc. are collected from the return material chute 64 into packets (not shown) in the elevator 65, and when a certain amount of the packets reaches a certain amount, the packets are transferred to a cylinder (not shown).

) is used to raise the inside of the elevator 65. Then, the bucket is tilted at the upper end position of the elevator 65, and the particles and debris 60 in the spring kerat are transferred to the net 6 in the melting furnace 22 through the chute 66 for charging into the melting furnace.
7 into a reproducing section 68 separated by 7.

Reference numeral 69 is a device for removing dross from the melt surface of the melting furnace 22, and as shown in FIGS. Move the dross remover 71 from position C to position D in the direction of arrow a, take in the dross on the surface of the melting furnace 22 into the dross remover 71, and move the dross remover 71 from the position (■) to the fulcrum 72.
The dross 73 taken into the dross remover 71 is discharged into the dross container 74 by rotating in the direction indicated by the arrow around .

Next, the operation of the die casting machine having the above structure will be explained.

First, in FIG. 5, both molds 45 and 46 are clamped by the movable frame drive device 26 by operating the operation panel 31, while molten metal 37 is supplied from the melting furnace 22 into the injection molding cylinder 23 by the water supply device 32. (See Figure 11(a)). Molten metal 3 supplied to the hot water supply path 44 in the cylinder 23
As shown in FIG. 11(b), 7 is an injection screw, which is driven at low speed by an injection screw 2.3a to push out the air to the biscuit 49 side, causing the air in the cylinder 23 to flow into the cavity 50 before the molten metal 37, and to vent the air. Remove from. Next, the piston J23a is driven at high speed, and as shown in FIG. Then, as shown in FIG. 11(d), the piston 23a is pushed out to the inside of the biscuit 49 at the tip of the cylinder to release the molten metal 37.
The cavity 50. ..., 50 is filled and casting is performed.

Next, with the product 53 attached to the movable mold 46 side, both the molds 45 and 46 are separated, and a trimming die 55 is inserted between the molds 45 and 46 as shown by the dashed line in FIG. let

Next, the product 53 is extruded from the movable mold 46 and fitted into the hole of the die h5.

Next, while removing the die 55 from between the molds 45 and 46, the nozzle 57. ..., from 57 to each mold 45
, 46 into the recesses 45a and 46a.

Next, both molds 45 and 46 are clamped again and the next casting is performed. On the other hand, for the die 55 holding the product 53,
The punch 58 for extruding the product is pressed to remove particles, debris 60, etc. formed integrally on the product 53, and the punch 5
The products 53 that have been extruded and finished by 8 are packed into boxes 63 on a conveyor 62 via a product chute 61 in predetermined quantities. At the same time, the above Paris and Kas 60
etc., are sent to the elevator 65 via the return material unit 64.
The melting material is temporarily collected in a bucket, transported above the melting furnace 22 by the elevator 65, and then charged into the melting furnace 22 through the melting furnace charging chute 66.

According to the embodiment described above, since the ball ingot 33 is used as the casting material, the material supply operation can be carried out extremely smoothly, and the ball ingot 33 can be preheated using the heat of the molten metal 37. Therefore, thermal efficiency can be improved.

In addition, a release agent application nozzle 57 provided on the die 55
．． ..., by changing the direction of 57, it is possible to freely change the injection angle, and the recesses 45a of the molds 45 and 46
, 46a can be evenly sprayed. Furthermore, the particles 60, etc. removed from the product 53 are quickly collected in a packet and returned to the melting furnace '22, which simplifies the collection work and completely removes particles 60, etc. Since it can be returned to the melting furnace 22 before it completely cools down, thermal efficiency can be improved.

Note that the present invention is not limited to this example, and can be implemented in various ways. For example, in the above embodiment, the support frame 4 is
8, the injection molding cylinder 23 was installed so that its tip was slanted upward, but as shown in FIG. With the frame 48, the hot water supply path 44 is provided so as to be approximately parallel to the axis G-G of the casting machine spanning between the pair of molds 45 and 46, as in the conventional case, and is installed on a triangular platform-shaped machine stand 75. Then, the hot water supply path 44 may be tilted by tilting the axis GG of the casting machine in the same way as in the previous embodiment. The supply of the molten metal 37 into the cylinder 23 and the driving operation of the piston 23a in this embodiment shown in FIGS. 13(a) to (ψ) are as shown in FIGS. ), the explanation will be omitted by assigning the same reference numerals to the same parts.

In this way, in a conventional casting machine, it is only necessary to replace the machine stand with the above-mentioned machine stand 75 (it is highly versatile.

Furthermore, since the amount of molten metal 37 supplied into the hot water supply path 44 is small at the tip end on the biscuit side, the temperature of the hot water at the tip end may drop before injection molding, and part of the molten metal 37 may solidify. There is a possibility that the degree of subsequent melting and mixing with other hot water may become uneven.

For this reason, as shown in FIG.
A baffle plate 85 having a curved surface 85a that is substantially the same as the inner circumferential portion of the cylinder 23 is provided near the fixed frame of the cylinder 23 so as to be movable up and down in synchronization with the piston 23a. When supplying the molten metal 37 into the hot water supply path 44, the dam plate 85 is raised to the position shown by the solid line ■I in FIG.
(See figure), when press-fitting the molten metal 37 into the 50 with a small amount of molten metal (48, 1□4o, 9o□-ka, 3. The molten metal 37 is lowered to the I position shown by the dashed line in the figure, and the molten metal 37 is smoothly inserted without interfering with the press-in of the molten metal 37.
It is designed so that it can be press-fitted inside. Note that the two-marked baffle plate 85 may be provided not only in the vicinity of the fixed frame as described above, but also within the fixed frame 24 as shown by the dotted line J in FIG. The shape of the weir plate 85 is shown in FIG.
) is not limited to the rectangular cross-section shown in FIG. 16(b), but may also be circular in cross-section as shown in FIG. If you do this,
Since the amount of molten metal 37 at the tip does not decrease,
Melt mixing is always uniform and quality can be made more stable.

In addition, the product is not limited to the one cast with a radial cavity centered on the biscuit 49 as shown in FIG. The biscuits 49 at intervals
It may also be a molded material 76, etc., which is formed by a cavity surrounding the material.

Furthermore, instead of the melting furnace 22, as shown in FIG. 18, exhaust smoke after heating the melting bot 36 is passed through the supply device 21, and the ball ingot 33 is preheated by the heat of the exhaust smoke. A melting furnace 77 may be used.

In FIG. 18, 78 is a seven cylinder for opening and closing the supply chute, and the cylinder 78 adjusts the supply amount of the pole ingot 33, and '79 is a cover for protecting the surface of the hot water.

Furthermore, instead of the hot water supply device 32 described in 1., a device as shown in FIGS. 19 and 20 may be used. In Fig. 19.20, 80 is a hot water tank, 81 is a support ground 1.8 having trapezoidal cam parts 81a, 81a on the sides and the hot water tank 80 at the lower end.
2 and 82 are a pair of lids for opening and closing the hot water level that are normally closed by spring bias, etc.; 83 and 83 are respectively provided upwardly projecting from the opening and closing lids 82 and 82; Bending the contact portion 83a.

As shown in FIG. 19, the narrow part 81b of the support arm 81 is inserted between the abutting parts 83a, 83a of the protrusion 83.83, and after insertion, as shown in FIG. As shown, by lowering the support arm 81 vertically downward, the abutting portions 83a, 83a are aligned with the support arm 8.
1 cam portion 81a.

Slide the sia to open the opening/closing lid 82.82, and the hot water 8
The molten metal 37 is made to flow into the interior of the molten metal 37. After that, the support arm 81
from the cam parts 81a, 81a to the contact parts 83a,
As 83a is removed, the opening/closing lids 82.82 are closed, and the molten metal 37 in the hot water reservoir 80 at the lower end of the support arm 81 is supplied from the hot water supply port 43 of the injection molding cylinder 23 to the hot water supply path 44.

This eliminates the need for the opening/closing nolinder 41 of the opening/closing lid, thereby simplifying the opening/closing mechanism.

As is clear from the above description, the present invention has the advantage that the bottom surface of the molten metal supply path for extruding the molten metal supplied into the injection molding cylinder from the molten metal feed port into the injection molding cylinder to the biscuit with the injection piston is raised sequentially in the extrusion direction. By forming the cavity on an inclined surface, first the air from the hot water supply path flows into the cavity, and then the molten metal is press-fitted, so there is less air mixed into the molten metal, and the product does not have sink marks or shrinkage cavities. In addition, even if the molten metal remaining in the biscuits, gates, etc. is solidified faster than the molten metal in the cavity, it does not affect the casting in the cavity, and the biscuits, gates, etc. It is possible to reduce the amount of remaining molten metal, make effective use of the metal on a monthly basis, and increase production efficiency.

Further, according to the present invention, since the bottom surface of the hot water supply path is inclined as described above, even when molten metal is supplied into the hot water supply path, the molten metal does not flow into the biscuit at the tip of the hot water supply path.
Cavities can be provided below the biscuit via a gate, for example, radially around the biscuit or surrounding the biscuit at regular intervals.

[Brief explanation of drawings]

Fig. 1 is a partially sectional side view of a conventional die-casting machine, Figs. 2(a) to 2(d) are explanatory diagrams showing the steps of supplying molten metal and press-fitting it into the cavity in the casting machine, respectively, and Fig. 3 (a) is a front view of the product cast by the above casting machine, FIG. 3(b) is a side view of FIG. 3(a), and FIG. 4 is a front view showing another example of FIG. 5 is a schematic plan view of a casting apparatus equipped with a die-casting machine showing one embodiment of the present invention;
The figures are a plan view and a longitudinal sectional view of the melting furnace shown in Fig. 5, respectively, Fig. 8 is a partially sectional side view of the casting machine shown in Fig. 5, and Fig. 9 (
a) is a front view showing an example of a product cast by the casting machine shown in FIG. 8, FIG. 9(b) is a longitudinal cross-sectional side view of FIG. 9(a), and FIG. 10(a) is a plan view of the dross removing device shown in FIG.
0) is a sectional view taken along the line X-X in FIG. 10(a), and FIGS. 11(a) to 11(d) show the process of supplying molten metal and press-fitting it into the cavity in the casting machine shown in FIG. 5, respectively. An explanatory diagram showing
FIG. 12 is a partially sectional side view showing another embodiment of FIG. 8;
13(a) to 13(d) are explanatory diagrams showing the steps of supplying molten metal and press-fitting it into the cavity in the casting machine shown in FIG. 12, respectively, and FIG. 14 shows the cylinder shown in FIG. 8 provided with a serration plate. FIG. 15 is an enlarged sectional view of the main part of the baffle plate, FIGS. 16(a) and (b) are perspective views of the baffle plate, and FIG. 17(a) is a longitudinal sectional view of the main part showing the condition in which A front view showing another embodiment of the product shown in FIG. 9, FIG. 17(b) is a vertical cross-sectional side view of FIG. 17(a), and FIG. 18 is another embodiment of the melting furnace shown in FIG. 7. FIG. 19 is a longitudinal cross-sectional view showing an example, and FIG. 19 is a front view of the opening/closing lid in the closed state, showing another embodiment of the water heater, and FIG. 20(a) is the opening/closing lid of the hot water device shown in FIG. 19. 20(1) is a side view of FIG. 20(a). 23... Cylinder for injection molding, 23a... Piston for injection, 37... Molten metal, 43... Hot water supply port, 44...
・Hot water supply path, 49...biscuit, 50...cavity, 51...gate. Patent applicant: Tokai Rika Denki Seisakusho Co., Ltd. Agent: Patent attorney Aoyama Aoyama and two others Figure 14, Figure 17, Akane O) Figure 17(b) Figure 19rIA Figure 20(a) Figure 20(b)

Claims (1)

[Claims] (1) In a die casting machine that obtains a molded product by injecting molten metal pushed out by an injection piston of an injection molding cylinder from a biscuit into a molding cavity formed by a pair of closed molds through a gate, The bottom surface of the molten metal supply path through which the molten metal supplied from the molten metal supply port into the injection molding cylinder is pushed out to the biscuit by the injection piston is formed into an inclined surface that rises sequentially in the extrusion direction. Die casting machine. (2. The casting machine as set forth in claim 1 is characterized in that the axis of the casting machine spanning between the pair of molds is inclined so as to be approximately parallel to the hot water supply path. die casting machine.